Security: 4-digit combination lock with 10,000 combinations. Metal dials are easy to operate. The desired combination can be easily reset at any time. High security and strong anti-theft protection. High Quality: Double-layer construction made of anti-rust zinc alloy, resistant to hammering, cutting, and corrosion. Includes a sliding weatherproof cover to protect the combination dial from dust and moisture. Large Storage Space: Internal dimensions of 3.5 x 2.8 x 1.1 inches (L x W x D), capable of holding up to 5 standard keys or 3 large keys, as well as car keys, room cards, and other small items. Easy to Install: All necessary mounting hardware included for both wall and door installation. Clear, step-by-step bilingual instructions for easy setup. Applicable Locations: Suitable for garages, gardens, classrooms, factories, businesses, stores, universities, dormitories, homes, and vacation properties. Provides convenient access and reliable security.